Random review:
“While I spent time playing with Tux over the last few days, in addition to the time I have previously spent using this software in classrooms, I am never disappointed by what is has to offer. A child can make a simple picture, or use the special features more in depth to create detailed and real life technology based paintings.”
— Jamie Krinsky's Blog, November 2011

Reviews - Macworld Magazine - April 2007

Kid's Digital Easel
New Life for Old Macs

A Child's Art Station
Tux Paint provides hours
of entertainment for
youngstersPhoto by Peter Belanger

Does your five-year-old watch in fascination as you work with Photoshop?
Encourage your child's interests by turning your retired Mac into a
digital art station.

Prepping the Canvas

Small children often have trouble drawing with a mouse, so invest in
a pen tablet such as Wacom's Graphire 4x5 [...] Use the Wacom Tablet
preference pane to configure the device's behavior (for example, you might
want to disable the pen's side button to prevent your child from
accidentally pressing it).

When it comes to drawing, check out the open-source painting program
Tux Paint. The program's art tools include a paintbrush a Stamp tool,
and a Magic tool that lets pint-size scribblers apply textures like grass
and sparkles.